Emulation

The most accurate modern Dragon 32 and Dragon 64 emulator is XROAR and this is available for many platforms direct from its homepage and has been ported to several other platforms. The next best solution is MESS which can also emulate the Project Alpha (Dragon Professional) and Project Beta machines, followed by the older MS-DOS based PC-Dragon II and T3 emulators.

One emulator that I would love to see ported is Mocha - It is a Java based emulator of the Tandy CoCo 2 and allows you to play games within your web browser - Would love to have a Dragon version to host here with full access to all the software.